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GLACIER
Cavity-Ringdown (CRD) Loss Meter and Reflectometer
Our reflectometer GLACIER uses the extreme sensitivity of cavity ring-down spectroscopy to
quantify the losses of advanced optical coatings down to 5 ppm. As a typical application the
device can characterize supra-mirrors with up to 99.9995 % reflectivity. Conventional
absorption and reflection measurements are not sufficiently sensitive to quantify today´s
super-reflective mirror coatings and are typically limited to the > 1000 ppm range
(corresponding to < 99.9 % reflectivity). Cavity ring-down spectroscopy measures optical
losses by the decay of the energy stored inside a cavity. The technique reaches unrivalled
sensitivity, because losses are experienced with each round trip inside the cavity over and over
again. Smaller losses lead to longer intra-cavity dwell time thereby automatically increasing
measurement precision. The device features high-speed data acquisition and allows to record
measurements within seconds. It is delivered complete with a computer and a user-friendly
software interface for acquisition and real-time analysis.
Key Product Features
Reflectivity measurements up to 99.9995%
Various angles of incidence: 5°-45° (and 0°)
S and p polarization (separately)
Antireflective coating characterization down to 0.0005% (5 ppm)
Simple and reproducible alignment for 0.5”, 1” and 2” optics
Spring-loaded mirror fixtures for reproducible mounting without strain
Computer and user-friendly software interface included
High-speed data acquisition and real-time analysis
Wavelengths in the range 375-1550 nm available
Footprint 90 x 45 cm²
Working Principle
Glacier uses the principle of reflectivity/loss measurements with cavity ring-down spectroscopy based on very low losses at each mirror bounce.
The laser pulses travel inside a cavity experiencing optical losses over and over again during each round trip.
Sketch of the working principle of GLACIER, measurement and fitting procedure
Sample Measurement
The device measures the time-dependent intensity I(t) leaked through an end mirror
of the cavity (center).
The signal decays with a time constant depending on the intra-cavity losses and can
be fitted to the following exponential function:
The time constant τ is inversely proportional to the optical losses (1-R) of the cavity
withtotal reflectivity R:
where n is the refractive index, c is the speed of light, and l is the cavity length
Typical GLACIER measurement of an ultrahigh-reflective mirror for 1030 nm.
To obtain the data, the cavity losses with and without the sample were
measured and subtracted. This provides an absolute measurement
of the test mirror
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For technical assistance, custom orders or email quotations, drop us an email at info@simtrum.com.
We will get back to you within 1 working days.
Local Same Day Service
-Singapore Main office: Call us at +65 6996 0391 Office Hours: 9am - 6pm (+8GMT)-China Shanghai Main office:Call us at +86 1500085 3620. Office Hours: 9am - 6pm (+8GMT)For Other Internation sales office click here.
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